# Homework Help: Integral aproximations,Plz help

1. May 2, 2010

### WayneH

Q: How many terms of the alternating series $$\sum((-2)^n)/n!$$ needed to find the sum to an accuray of 0.01?

What approximations r going to help? I can not do with Riemann,Trapezoidal and Simpson.

2. May 2, 2010

### Staff: Mentor

This is not a precalculus question. You should post problems like this in the Calculus & Beyond section.

Your text should provide information about error estimates for alternating series, namely that the first unused term in the series gives a bound for the error.